I get this error :
Looking for an AD and Office 365 Expert to assit me in solving this error
The operation on mailbox "User" failed because it's out of the
current user's write scope. The action 'Set-Mailbox', 'EmailAddresses', can't
be performed on the object 'User' because the object is being
synchronized from your on-premises organization. This action should be
performed on the object in your on-premises organisation.